Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ac79b5a6b0e3105dd1b91fb5b9d411c806082f0442ba2e88db0bdb48f9113d' 
  AND token = 'T7LbatAS0HqxOIcRwWvwHpcsoHl9LdaDr/3OUbnAa4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}